# Bignum#to\_s(10) broken

**URL:** <https://www.ruby-forum.com/t/bignum-to-s-10-broken/74466>\
**Category:** Development\
**Created:** [November 7, 2006, 10:44am UTC](https://www.ruby-forum.com/t/bignum-to-s-10-broken/74466 "2006-11-07T10:44:47Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![U.Nakamura](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/b5ac83/32.png) [@U.Nakamura](https://www.ruby-forum.com/u/U.Nakamura)\
**Post date:** [November 7, 2006, 10:44am UTC](https://www.ruby-forum.com/t/bignum-to-s-10-broken/74466/1 "2006-11-07T10:44:47Z")

</div>

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e$B:G6a$Ne(Bbignum.ce$B$NJQ99e(B(rb\_big2str0)e$B$G$9$,!"4p?t$,e(B10(e$B!Ae(B15)e$B$N;~$Ke(B  
e$B%P%C%U%!$,0l7eB-$j$F$J$$$h$&$G$9!#e(B  
e$B7k2L$H$7$FId9f$,DY$l$F$7$^$C$F$$$^$9!#e(B

# Index: bignum.c

RCS file: /home/cvs/ruby/bignum.c,v  
retrieving revision 1.100.2.26  
diff -u -1 -p -r1.100.2.26 bignum.c  
— bignum.c 30 Oct 2006 03:24:19 -0000 1.100.2.26  
+++ bignum.c 30 Oct 2006 08:41:13 -0000  
@@ -647,3 +647,3 @@ rb\_big2str0(x, base, trim)  
case 10: case 11: case 12: case 13: case 14: case 15:

- j = j \* 241L / 800;

- j = j \* 241L / 800 + 1;  
break;

e$B$=$l$G$O!#e(B

---

<div class="post-metadata">

**Author:** ![U.Nakamura](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/b5ac83/32.png) [@U.Nakamura](https://www.ruby-forum.com/u/U.Nakamura)\
**Post date:** [November 7, 2006, 10:44am UTC](https://www.ruby-forum.com/t/bignum-to-s-10-broken/74466/2 "2006-11-07T10:44:53Z")

</div>

e$B$^$D$b$He(B e$B$f$-$R$m$G$9e(B

In message “Re: [ruby-dev:29710] Bignum#to\_s(10) broken”  
on Mon, 30 Oct 2006 17:44:19 +0900, “U.Nakamura”  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes:

|e$B:G6a$Ne(Bbignum.ce$B$NJQ99e(B(rb\_big2str0)e$B$G$9$,!"4p?t$,e(B10(e$B!Ae(B15)e$B$N;~$Ke(B  
|e$B%P%C%U%!$,0l7eB-$j$F$J$$$h$&$G$9!#e(B  
|e$B7k2L$H$7$FId9f$,DY$l$F$7$^$C$F$$$^$9!#e(B  
|e$B8+$F$J$$$1$Ie(B1.9e$B$be(B?

e$B$=$NDL$j$G$9!#%Q%C%A\<h$j9~$\_$^$7$?!#e(B

---

<div class="post-metadata">

**Author:** ![U.Nakamura](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/b5ac83/32.png) [@U.Nakamura](https://www.ruby-forum.com/u/U.Nakamura)\
**Post date:** [November 7, 2006, 10:44am UTC](https://www.ruby-forum.com/t/bignum-to-s-10-broken/74466/3 "2006-11-07T10:44:54Z")

</div>

e$B$3$s$K$A$O!"$J$+$`$ie(B(e$B$&e(B)e$B$G$9!#e(B

In message “[ruby-dev:29710] Bignum#to\_s(10) broken”  
on Oct.30,2006 17:44:19, [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:  
| - j = j \* 241L / 800;

e$B$H$3$m$G!“$3$Ne(B 241/800  
e$B$Oe(Blog10(2)e$B$N6a;wCM$@$H;W$&$N$G$9$,!”$3e(B  
e$B$NCM$G$“$k$N$K$O2?$+?\<$$M}M3$,$”$k$N$G$7$g$&$+e(B?  
e$B$3$N\<0$@$18+$F9M$($k$H!"MW5a$5$l$k6a;wCM$H$7$F$O!"e(B

- log10(2) e$B$h$j$OBg$-$/$F!"e(B
- e$B%\*!\<%P!\<%U%m!\<$rCY$i$;$k$?$aJ,;R$,\>.$5$$$[$&$,$h$$e(B  
e$B$N$h$&$K;W$($^$9!#e(B

e$B$3$N4QE@$+$i9M$($k$H!"Nc$($Pe(B 146/485  
e$B$NJ}$,6a;wCM$H$7$F$OM%$le(B  
e$B$F$$$k\>e$KJ,;R$,\>.$5$$$G$9$7!"e(B87/289 e$B$de(B 28/93  
e$B$J$I$b!"6a;wEYe(B  
e$B$Oe(B 146/485 e$B$K$o$:$+$K5Z$P$J$$$J$,$i$be(B 241/800  
e$B$h$j$O%^%7$G$9e(B  
e$B$7!"J,;R$b$0$C$H\>.$5$/$J$j$^$9!#e(B

e$B$=$l$G$O!#e(B

---

<div class="post-metadata">

**Author:** ![U.Nakamura](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/b5ac83/32.png) [@U.Nakamura](https://www.ruby-forum.com/u/U.Nakamura)\
**Post date:** [November 7, 2006, 10:44am UTC](https://www.ruby-forum.com/t/bignum-to-s-10-broken/74466/4 "2006-11-07T10:44:59Z")

</div>

e$B$^$D$b$He(B e$B$f$-$R$m$G$9e(B

In message “Re: [ruby-dev:29712] Re: Bignum#to\_s(10) broken”  
on Mon, 30 Oct 2006 18:43:40 +0900, “U.Nakamura”  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes:

|In message “[ruby-dev:29710] Bignum#to\_s(10) broken”  
| on Oct.30,2006 17:44:19, [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:  
|| - j = j \* 241L / 800;  
|  
|e$B$H$3$m$G!“$3$Ne(B 241/800 e$B$Oe(Blog10(2)e$B$N6a;wCM$@$H;W$&$N$G$9$,!”$3e(B  
|e$B$NCM$G$“$k$N$K$O2?$+?\<$$M}M3$,$”$k$N$G$7$g$&$+e(B?  
|e$B$3$N\<0$@$18+$F9M$($k$H!"MW5a$5$l$k6a;wCM$H$7$F$O!"e(B  
| \* log10(2) e$B$h$j$OBg$-$/$F!"e(B  
| \* e$B%\*!\<%P!\<%U%m!\<$rCY$i$;$k$?$aJ,;R$,\>.$5$$$[$&$,$h$$e(B  
|e$B$N$h$&$K;W$($^$9!#e(B  
|  
|e$B$3$N4QE@$+$i9M$($k$H!"Nc$($Pe(B 146/485 e$B$NJ}$,6a;wCM$H$7$F$OM%$le(B  
|e$B$F$$$k\>e$KJ,;R$,\>.$5$$$G$9$7!"e(B87/289 e$B$de(B 28/93 e$B$J$I$b!"6a;wEYe(B  
|e$B$Oe(B 146/485 e$B$K$o$:$+$K5Z$P$J$$$J$,$i$be(B 241/800 e$B$h$j$O%^%7$G$9e(B  
|e$B$7!"J,;R$b$0$C$H\>.$5$/$J$j$^$9!#e(B

e$B$(!\<$H!“A4A33P$($F$$$J$$$s$G$,!”$I$3$+$+$i$=$N$^$^;}$C$F$-$?e(B  
e$B?tCM$N$h$&$K;W$$$^$9!#$G$b!“e(BGoogle  
CodeSearche$B$G$be(BRubye$B$N%=!\<e(B  
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# e$B$G$-$k$b$N$J$ie(Bbignum.ce$B$He(Bnumeric.ce$B$K$O?($j$?$/$J$$!#e(B

```
                            e$B$^$D$b$He(B e$B$f$-$R$me(B /:|)

```

---

<div class="post-metadata">

**Author:** ![U.Nakamura](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/b5ac83/32.png) [@U.Nakamura](https://www.ruby-forum.com/u/U.Nakamura)\
**Post date:** [November 7, 2006, 10:45am UTC](https://www.ruby-forum.com/t/bignum-to-s-10-broken/74466/5 "2006-11-07T10:45:04Z")

</div>

e$B$3$s$K$A$O!"$J$+$`$ie(B(e$B$&e(B)e$B$G$9!#e(B

In message “[ruby-dev:29713] Re: Bignum#to\_s(10) broken”  
on Oct.30,2006 18:54:48, [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:  
| e$B$(!\<$H!“A4A33P$($F$$$J$$$s$G$,!”$I$3$+$+$i$=$N$^$^;}$C$F$-$?e(B  
| e$B?tCM$N$h$&$K;W$$$^$9!#$G$b!“e(BGoogle CodeSearche$B$G$be(BRubye$B$N%=!\<e(B  
| e$B%9$7$+8+$D$+$i$J$$$J!#$h$1$l$P!”$&$5$5$s$NJ}$GCV$-49$($F$$$?e(B  
| e$B$@$1$^$;$s$+!)e(B

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e$B$7$F!"$5$i$Ke(Bebane$B$5$s$,8+$D$1$?JL$N6a;wCM$KJQ99$7$F$\*$-$^$7$?!#e(B

e$B$3$l$G=\>Mh$_$h$===?J?t$Ge(B270e$BK|7e$K$J$ke(BBignume$B$Ne(Bto\_se$B;~$K%_!\<%P!\<e(B  
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e$B$N$G$9$,!"7e$,$G$+$9$.$F3NG’$G$-$^$;$s$G$7$?e(B orz

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